Problem Solving
试题详情
题目：
Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75 percent fescue. If a mixture of X and Y contains 30 percent ryegrass, what percent of the weight of the mixture is X ?
选项:
A、10%
B、
C、40%
D、50%
E、
答案:
B
